Machine learning

and stuff...

Artificial Intelligence

Machine Learning

Neural Networks

Tensor Flow

Computer Vision

	Humans	Machines
Hard
Easy

personIsPresent = true

Label

Feature

x

y

\theta_{j} := \theta_{j} - \alpha\frac{\partial}{\partial\theta_{j}}J(\theta_{0}, \theta_{1})

\theta_{j} := \theta_{j} - \alpha\frac{\partial}{\partial\theta_{j}}J(\theta_{0}, \theta_{1})

j = 0: \frac{\partial}{\partial\theta_{0}}J(\theta_{0}, \theta_{1}) = \frac{1}{m} \sum_{i=1}^{m}(h_{\theta}(x^{(i)}) -y^{(i)})

j = 0: \frac{\partial}{\partial\theta_{0}}J(\theta_{0}, \theta_{1}) = \frac{1}{m} \sum_{i=1}^{m}(h_{\theta}(x^{(i)}) -y^{(i)})

B = A^T

B = A^T

h_{\theta}(x) = \theta_{0} + \theta_{1}x

h_{\theta}(x) = \theta_{0} + \theta_{1}x

Kud svi Turci, tu i mali Mujo

Created by
Industry standard
Quick and easy start
Not ideal for Computer Vision
Requires good datasets

* Isn't Pythonic

Computer vision

if(a){
 // do stuff
} else if(b){
 // do some stuff
} else if(c){
 // do some other stuff
} else if(d){
 // do completely different stuff
} else if(e){
 // don't do stuff
} else if(f){
 // hope it doesn't come to this
}

A bunch of ifs

Machine learning

to learn

is to generalize

Linear Regression

Random forest

k-Nearest Neighbors

Support Vector Machine

Hammer Rant time

Machine Learning

\neq

\neq

<rant>

</rant>

x_1

x_1

x_2

x_2

x_3

x_3

w_1

w_1

w_2

w_2

w_3

w_3

b

y = \begin{cases} 0 &\text{if } \sum_j{w_j x_j} \leq b \\ 1 &\text{if } \sum_j{w_j x_j} > b \end{cases}

y = \begin{cases} 0 &\text{if } \sum_j{w_j x_j} \leq b \\ 1 &\text{if } \sum_j{w_j x_j} > b \end{cases}

$x_i$ $\in \{0, 1\}$ - input values
$w_i$ $\in \mathbb{R}$ - weights
$b$ $\in \mathbb{R}$ - threshold
$y$ $\in \{0, 1\}$ - output value

y

Perceptron

Neural networks

Face Swapping

Head pose
Skin type
Lighting
Resolution
...

Things to consider

Face Detection

Facial feature extraction

convex hull

Finds boudaries of the face
Efficient
Speeds up further computation by A LOT

Delaunay triangulation

Triangulation refers to the subdivision of a plane into triangles

A

D

C

B

t_1

t_1

t_2

t_2

A

D

C

B

t_1

t_1

t_2

t_2

A

B

All facial features

ConVEx hull

<

speed

Delaunay triangulation

Affine Warping

Affine transformations

Rotation

Shearing

Scaling

Translation

Seamless Cloning

Before

After

Thank you for your attention!

Aleksandar Šmigić